From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4C192C43603 for ; Mon, 9 Dec 2019 08:38:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2B1C12075B for ; Mon, 9 Dec 2019 08:38:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727232AbfLIIiq (ORCPT ); Mon, 9 Dec 2019 03:38:46 -0500 Received: from gate.crashing.org ([63.228.1.57]:59919 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727113AbfLIIio (ORCPT ); Mon, 9 Dec 2019 03:38:44 -0500 Received: from gate.crashing.org (localhost.localdomain [127.0.0.1]) by gate.crashing.org (8.14.1/8.14.1) with ESMTP id xB98c8a0027516; Mon, 9 Dec 2019 02:38:08 -0600 Received: (from segher@localhost) by gate.crashing.org (8.14.1/8.14.1/Submit) id xB98c6QK027514; Mon, 9 Dec 2019 02:38:06 -0600 X-Authentication-Warning: gate.crashing.org: segher set sender to segher@kernel.crashing.org using -f Date: Mon, 9 Dec 2019 02:38:06 -0600 From: Segher Boessenkool To: Christophe Leroy Cc: Haren Myneni , mpe@ellerman.id.au, hch@infradead.org, mikey@neuling.org, npiggin@gmail.com, herbert@gondor.apana.org.au, linuxppc-dev@lists.ozlabs.org, devicetree@vger.kernel.org, sukadev@linux.vnet.ibm.com Subject: Re: [PATCH V2 00/13] powerpc/vas: Page fault handling for user space NX requests Message-ID: <20191209083806.GA3152@gate.crashing.org> References: <1575861522.16318.9.camel@hbabu-laptop> <8ba807dd-9d5a-e42a-60e8-f9ad648026bf@c-s.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8ba807dd-9d5a-e42a-60e8-f9ad648026bf@c-s.fr> User-Agent: Mutt/1.4.2.3i Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Hi! On Mon, Dec 09, 2019 at 06:37:09AM +0100, Christophe Leroy wrote: > What do you mean by NX ? It is the Power9 "Nest Accelerator". The patch series should ideally mention that right at the start, yeah. > Up to now, NX has been standing for No-eXecute. That's a bit in segment > registers on book3s/32 to forbid executing code. That bit is called just N fwiw (and not really specific to 32-bit -- on 64-bit implementations it was part of segment table entries, and of SLB entries on newer machines). Segher